31 "Doughboy" was a slang term for an American infantryman in World War I. There is some speculation as to the origin of the term but this one makes most sense to me: In Texas, U.S. Infantry in training along the Rio Grande were powdered white with the dust of adobe soil, and hence were called "adobes" by mounted troops. It was shortened to "dobies" and then became "Doughboys."
For more on the Postal Service with the A.E.F., see this related essay.
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